package com.yaosheng.thread.map;

import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Created by yaosheng on 2021/7/5.
 */
public class TestCopyOnWriteList {

    public static void main(String[] args) {

        List<String> lists = new CopyOnWriteArrayList<> ();
        Random r = new Random ();
        Thread[] ths = new Thread[100];

        for(int i = 0;i < ths.length;i ++){
            Runnable task = new Runnable () {
                @Override
                public void run() {
                    for(int i = 0;i < 1000;i ++) lists.add ("2" + r.nextInt (10000));
                }
            };
            ths[i] = new Thread (task);
        }
        runAndComputeTime (ths);
        System.out.println (lists.size ());
    }

    static void runAndComputeTime(Thread[] ths){

        long s1 = System.currentTimeMillis ();
        Arrays.asList (ths).forEach (t -> t.start ());
        Arrays.asList (ths).forEach (t -> {
            try{
                t.join ();
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
        });
        long s2 = System.currentTimeMillis ();
        System.out.println (s2 - s1);
    }
}
